Driving-gearing for tractors.



C. W. JACKSON.

'nmvlNG GEARING Fon TRAcToas.

APPLICATION FILED JUNE 19. 1916.

1,255,31 Patented Feb. 5, 1918.

CLARENCE W. JACISONVOF VALIER, MONTANA, ASSIGNOR 0F FIFTY-EIVE O NE- HUNDREDTHS 'ro DAVID n.

MAINS .AND TWENTY-TIVO AND ONE-HALF ONE- I-IUNDBEDTHS TO ALVIN 1)..RIE1D1TR,A BOTH 0F VALIER, MONTANA.

Y DRIVING-Guarana non TRAcTons. i

Specication of Letters Patent. t

rammed Fens, i918. Y

Original application led May 3, 1915, Serial 110.25.598. 1 Divided and this application led June 19, 1916.* i A Serial 170.104,518.

To all fwtom t may concern.'

Be 1t known that I, CLARENCE W. vJACK- soN, a subject of the King of Great Britain,

(who has declared his intention of becoming a citizen of the United States.) residing at Valier, county of-Teton, and State of Montana, have Vinvented certain new and useful Improvements in Driving-Gearingfor Tractors, of which the following is a specification.

This lnvention l Y relatesto driving gearing for tractors.

This application is a division ofmy ap'- plication for tractor agricultural machines,

filed May 3, 1915, Serial No. 25,598, and the i invention has for its object the provision of `novel driving gearing therefor which is practically noiseless and self-locking so that when the tractor is either ascending or descending an incline, the gearing is self-braking and no extraneous brakes are required. It also has other advantages which will appear more fully hereinafter.

The embodiments of the invention herein after set forth and shown in the accompanying drawings are to be considered as illustrative, rather than restrictive, of the scope of the invention, as modifications may be resortedto without departing from the essential principles thereof.

` ln the accompanying drawings ;i

Figure 1 is a longitudinal section through the driving means for the rear traction wheels of a tractor;

Fig. 2, a detail view of the novel worm gearing and differential; e

Fig. 3, a section taken through the trans mission; j Fig. 4, a detail of the differential; `and Fig. 5, a detail of certain gears of the transmission. i

The traction wheels2 are of the usual construction. The solid shaft 6 is keyed to one of the traction wheels 2 and the tubular shaft 7 is loose on'said shaft 6 and is keyed to the hub of the remaining traction wheel and expanded into engagement therewith by a taper plug 8 which is afterward secured by a pin 9. Keyed to the shaft is the gear 10 constituting one 4part of the dili'erential.

` t Secured to the ange 11 is another gear 12 of the diiferential. The diiferential casing contains the large worm wheel 15 which car` riesseveral spurV gears, preferably siX,in

dicated as 16 adapted to mesh with the gears 10 and 12. `llhe gears 10 and 12 are contained within the worm wheel 15 and the latter is provided with hubs which are Vmounted. on the solid shaft 6 and the hollow shaft 7. The vworm wheel 15 is provided with Y truncated, conical, rotary or roller teeth 17 carried loosely on bolts 18. The i troduction of oil within the gear casing.`

The worm 21 is of the concavoftype adapted to mesh with several of the rotary teeth 17 and iscarried by the shaft 22`which runs direct at the same speed as the motor 23 on the medium or work speed of the machine which is slightly under three miles per hour.

The worm gearing described is practically noiseless and is self-locking so that when the machine is descending an incline,'it isV self-braking and no extraneous brakes are required.

The transmission gearing which is shown in Figs. 3 and 5, embodies improvements whereby the worm 2l is driven direct from the motor, without throwing in any intermediate gears, when operatingf at the nor- `mal or medium work speed, thereby eliminating the noise and wear incident to the Vuse of gears hitherto used at work or medium'speed. Y Y

The gears 22, 22", 22, 22d, are loose on shaft 22. 'The double claw clutches 21a, 2lb,`

are loosely splined to shaft 22 and may remain in neutral position or be engaged with said gears, accordin to the speed required.

To the countersha t 23a are secured the gears'23", 23e, 23d, 23, respectively meshing with idler gear 211a and gears 22", 22C, 22d.

Gear 22d is slidable on shaft 22 and intov achamber 25a and, when disposed therein, is out of mesh with gear 23e. y Y

The Vgear 221 is keptl normally in mesh withl gear 23e by a spring surroundinv` motor shaft 22.X and pressing a cap 26al against the end of the hub of gear 22d, said y loose on. shaft 21 but slidably coupled by splining at 26b to shaft 22". Gears 23e and gear being t A f Y Y)22d arefalways"V inme'sh Wheurunning on Y' and out'ofv engagement with gear Qijhere- 'byvcoupling shafts'), and22x and causing 'Wthvgear 22d-andcarried into chaniuerQa Y' fthefwormfQlio bedrven atthe same speed gears .Low speedh .forheavy -Workorhigh speed for travel on'roads may be Yhada-by i f-Y- vflusingthe OtherL gears.v Y

.,thussdeseribed my vinvention, what v er Pgatent-,g is:

A 1T ansmissonzand propulsion gearing 09msgnature.

prisingV an engine or power shaft, a driven VShaft,` Worm gearin Y shaft, a counter-shatt, lgearsonsaid counterdriven by said driven shaft, gears on the driven shaft,`-c1utches for eonnectingdi'erent ones yo'ithesets of gears ,of the driven shaft and eountershaft for active operation, a spring actuated driving Y Y v v Y gear slidably coupled to the power shaftand. Y asft'he-Ymotorwithoutfthe use of any 'ofthey normally: meshing with a gearfon `Jche counits mating gear .on che i eountershaft.

.In testimony .Wherecf, I hereunto aix my X@LARENCEv W. K'JACKSON.

' a i Curieuxbfhisrpatentmgy befebtairned'f'er'vefcents each; by addressingrthe commissionenof Patents, 

